John Mcmahon, LCSW
NPI 1548464092 · Social Worker · Westborough, MA
Enrolled with Medicare as Practitioner - Clinical Social Worker · source: CMS PECOS Public Provider Enrollment (2026.04.01)
John Mcmahon, LCSW is a Social Worker provider in Westborough, MA (NPI 1548464092).
Provider details
- NPI number
- 1548464092
- Entity type
- Individual
- Primary specialty
- Social WorkerBehavioral Health & Social Service Providers
- Credential
- LCSW
- Sex
- Male
- Sole proprietor
- No
- License
- 213699 (MA)
Specialties & taxonomies
Behavioral Health & Social Service Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
19 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
Practice location
Mailing address
Registry dates
- Enumerated
- 2007-06-11
- Last updated
- 2019-03-26
Frequently asked questions
- What is John Mcmahon's NPI number?
- John Mcmahon's National Provider Identifier (NPI) is 1548464092, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is John Mcmahon's specialty?
- John Mcmahon is listed in the NPPES registry with a primary specialty of Social Worker (Behavioral Health & Social Service Providers).
- Where is John Mcmahon located?
- John Mcmahon's practice location on file with NPPES is 900 Union St, Westborough, MA 01581-5408.
- What is John Mcmahon's phone number?
- The practice phone number listed in the NPPES registry for John Mcmahon is (508) 898-2338.
- Does John Mcmahon accept Medicare?
- John Mcmahon is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is John Mcmahon's NPI active?
- Yes — John Mcmahon's NPI (1548464092) is active in the NPPES registry as of the last update on 2019-03-26.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.